package com.gmics.unifiq.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.google.android.gms.maps.model.LatLng;
 
public class DirectionsJSONParser
{
 
/**
* Method to decode polyline points
* Courtesy : jeffreysambells.com/2010/05/27/decoding-polylines-from-google-maps-direction-api-with-java
* */
private List<LatLng> decodePoly(String encoded)
{
 
List<LatLng> poly = new ArrayList<LatLng>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
 
while (index < len)
{
int b, shift = 0, result = 0;
do
{
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
 
shift = 0;
result = 0;
do
{
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
 
LatLng p = new LatLng(((lat / 1E5)), ((lng / 1E5)));
poly.add(p);
}
 
return poly;
}
 
/** Receives a JSONObject and returns a list of lists containing latitude and longitude */
public List<List<HashMap<String, String>>> parse(JSONObject jObject)
{
List<List<HashMap<String, String>>> routes = new ArrayList<List<HashMap<String, String>>>();
JSONArray jRoutes = null;
JSONArray jLegs = null;
JSONArray jSteps = null;
JSONObject jDistance = null;
JSONObject jDuration = null;
 
try
{
	jRoutes = jObject.getJSONArray("routes");
	/** Traversing all routes */
	for (int i = 0; i < jRoutes.length(); i++)
	{
		jLegs = ((JSONObject) jRoutes.get(i)).getJSONArray("legs");
		List<HashMap<String, String>> path = new ArrayList<HashMap<String, String>>();
		/** Traversing all legs */
		for (int j = 0; j < jLegs.length(); j++)
		{
			/** Getting distance from the json data */
			jDistance = ((JSONObject) jLegs.get(j)).getJSONObject("distance");
			HashMap<String, String> hmDistance = new HashMap<String, String>();
			hmDistance.put("distance", jDistance.getString("text"));
			 
			/** Getting duration from the json data */
			jDuration = ((JSONObject) jLegs.get(j)).getJSONObject("duration");
			HashMap<String, String> hmDuration = new HashMap<String, String>();
			hmDuration.put("duration", jDuration.getString("text"));
			 
			/** Adding distance object to the path */
			path.add(hmDistance);
			 
			/** Adding duration object to the path */
			path.add(hmDuration);
			 
			jSteps = ((JSONObject) jLegs.get(j)).getJSONArray("steps");
			 
			/** Traversing all steps */
			for (int k = 0; k < jSteps.length(); k++)
			{
				String polyline = "";
				polyline = (String) ((JSONObject) ((JSONObject) jSteps.get(k)).get("polyline")).get("points");
				List<LatLng> list = this.decodePoly(polyline);
				 
				/** Traversing all points */
				for (int l = 0; l < list.size(); l++)
				{
					HashMap<String, String> hm = new HashMap<String, String>();
					hm.put("lat", Double.toString((list.get(l)).latitude));
					hm.put("lng", Double.toString((list.get(l)).longitude));
					path.add(hm);
				}
			}
		}
		routes.add(path);
	}
	 
} 
catch (JSONException e)
{
	e.printStackTrace();
} 
catch (Exception e)
{
}
 
return routes;
}
}